Gage-glass apparatus.



D. R. MAGBAIN. GAGE GLASS APPARATUS.

APPLICATION FILED DBC. 2G, 1912.

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Patented Juy 28, 41914.

lNVENTR n MH iff/16%- n I tlh'lllil DONALD R. MACBAIN,

GAGE-GLASS i l (l5. i Si). 'Specification of Application filed December 26, 1912.

OF CLEVELAND, OHIO.

APPARATUS.

Letters Patent. Patented Jnly 28, 1914i..

Serial No. 738,620

Be it known that l. DoNaLn R. MMBMN, a citizen ol the United States, residing at Cleveland. in the county ot' Cuyahoga and tt-.itc ot' Ohio, have invented certain new and use'lul Improvements in GageGlass Ap paratus, of which the following is a specification.

This invention has reference to the provision of an improved form of mechanism whereby to sate-guard the fireman from danger or' injury due to the bursting ofthe steam boiler gage glass, such for example as is commonly used in locomotive work.

The first of the objects of thispresent invention is the provision of a device which will insure an effective drainage or escape notonly for the Steam and hot water in case the glass bursts, but also for the broken particles of the glass itself, and this without interfering in any manner with the ready inspection of the glassor the height of the water therein.

rThe above as well as such other objects as may hereinafter appear, I attain by means 0f a construction which l have'illustrated in referred form in the accompanying; drawmgs, wherein,

Figure l represents in side elevation the rear end of a boiler shell with my inprovement applied tl'iereto', Fig. Q is a vertical sectional view through the improved glass mechanism; Fig. 3 is a transverse sectional view on the line lI-HI of Figure 4; Fig. i is a rear view in elevation of the mechanism shown in Fig. 52; and Fig. 5 is a detailed view indicating the preferred form of connection which ll employ between the casing or' the device and the outlet pipe or drain tube. 1

Referring; now more particularly to Fignre 1, it will be seen' that I have therein indicated the rear end of a boiler shell marked 6 on which there is a valve connection 7 leading to a tube 8 that. in turn connects at its lower end with the upper end ot a casing 5) which forms the main casing' or body of my apparatus, and in whieh l provide a couple of sockets or seats indicated particularly in'Fig. 3 ai the point marked IO, lsuch seats being; constructed to receive -tho vertically slidableilat glass pieces or windows l'l which are to be made ot heavy, durable glass such as will withstand considerable heat and shock. The plates or glass pieces` 1l are held by the recesses at either side ot' the socket l0 and are iree to be slid upwardly and removed for cl aning or for inspection ot' the gage glass on the'interior of the main or body casingl l). The gage glass proper-indicated at lQ-is secured by means of the packing `123 at its upper and lower ends through the instrumentality otl suitable glands or packing, nuts l-.l and l5. the lower nut 15 being formed as the prol ]ection upon the body 16 of the valve 17 that controls the lower communication from the'interior of the gage glass to the boiler.

YReferring now more particularly to Fig. al, it will be Seen that in constructing th' body portion of the apparatus, I have mad the metal or intermediate part of consider able diameter or dimension, as indicated a 19 and provided the saine with the neck por tions 2O and 2l and with laterally extender and inclined back wall 22 which is so arof ample size and ot' such direction as will most freely permit the ready escape of the steam and hot water and particles 0il glass in case of a rupture -ot the tube' The windows or plates .ll are ot .substantial thickness t'o withstand the torce of a rupture of the tube. l! and while they will permit some leakage ot'stcam around their edges, they are sntliciently tight to entirely prevent any injury to the atteuilant.

ln order to secure the best results, l ar range the outlet nozzle or projection 2lwhich also is of ample sizeefso that it. leads in a sloping downward direction and is connected with the lower discharge tulle i'by means otl a telescopic or sliding connecting mcniber 26, and is readily securei'l in place by the Cotter pin .27 when il is raised in position as shown. The outer tubi` ol'A LSCRP@ pipe 25 preferably leads to some point underneath the lioor of the eab or' the engine or somewhere at. such distance from the attendant as will avoid danger ot' scalding or injury, and is preferably securely attached to the boiler head by means of'supporting de-` vices 28, and the telescopieally movable menr ber 26 aifords a, convenient means for con necting or disconnecting the body portion or the device Where such operation is necessary.

The operation of my invention will, it is thought, be quite clear in connection withl the accompanying description of the strucranged that there is a full and vtree outlet\ ture, itbeing obvious that with the arranger ment'of the parts as described, in case of any breakage of .the glass tube 12, the Steam and het Water which escapes together with the broken parts of glass will find a ready outlet through the lateral chamber in front of the Wall 22 and the large opening 23 and pipe 25; and in order to further safeguard against danger of breakage of the glass plates ll, l make the device with the chamber around the tube 12 as well as the outlet passage described an of suiicient size so as to prevent the creation of any sudden or material pressure against the slides or plates l1, and with a View to the accomplishment of the same object, I extend the chamber that surrounds the tube 12 for a considerable distance longitudinally along the vtube so that no matter Where the breakage oecurs, there will be ample room for the escape of the parts or pieces and the Water and Steam.

Having thus described my invention and illustrated its use, what l claim as new 'and desire to secure by Letters Patent, is the following: 4

1. In combination in gage glass apparatus, a Gage glass, a casing surrounding the gage glgass and provided with a Window and a relief opening leading from one end of the casing, the cross sectional area of the casing increasing from the end remote from the relief opening to the end having said opening.

2. 1n combination in gage glass apparatus, a gage glass, a casing surrounding the gage glass and provided with a Window and a relief opening leading from the lower end of the casing, the rear `Wall of the casing extending downward and inclined to the rear providing an enlargement at-the lower end of the casing.

3. In combination in gage glass apparatus, a gage glass, a casing surrounding the gage glass and provided With a Window and with a longitudinally inclined rear Wall lying opposite the gage Glass, there being a relief opening leading from the end of the casing having the larger cross sectional area.

4. In combination in gage glass apparatus, a gage glass, a casing surrounding the gage glass and provided with a Window, the said casing having its Wall behind the gage glass bulged ont from a pocket extending longitudinally of the casing from the upper to the lower portion thereof and providing a relief area, and a vertical pipe of relatively large cross sectional area leading into the lower portion of said relief "area, and in ap proximate alinement With the pocket the rea-r Wall of the relief pocket lying farther from the gage glass than the inner surface of the said Window from said gage glass.

5. In combination in gage glass apparatus, a gage glass, a casing surrounding the gage glass and provided with a- Window, and with a tapering relief pocket having an inclined wall back of the frage glass, and a relief pipe leading from the larger portion of the pocket.

In testimony whereof I have hereuntol signed my name in the presence of the two subscribed witnesses.

DONALD R. MACBAN.

lVitnesseS R. M. BROWN, RALrH MCIN'rosH. 

